copy_from_user
IDENT(copy_to_user); IDENT(copy_from_user);
copy_from_user(foo, pointer, sizeof(*foo));
int copy_from_user(void *dest, void *src, int size);
copy_from_user(dest, pointer, sizeof(*dest));
copy_from_user(a, src, sizeof(*a));
copy_from_user(&x, src, sizeof(int));
copy_from_user(&dest->x, src, sizeof(int));
int copy_from_user(void *dest, void *src, int size);
# define COPYIN(a,b,c) copy_from_user((caddr_t)(b), (caddr_t)(a), (c))